渤海湾裂缝性稠油油藏开发主控因素分析

渤海湾裂缝性潜山稠油油藏具有稠油、裂缝、花岗岩基质及位于海上等特点,目前国内外尚无开发先例。为明确该类油藏开发中地质静态参数对开发的影响,通过控制变量法,改变单一参数变量,对影响该类油藏开发效果特有的裂缝倾角、裂缝方位角、裂缝密度、裂缝开度、裂储比及基质渗透率等关键地质参数进行了评价分析。研究表明,裂缝开度、裂缝密度和裂储比对裂缝产量影响较大;基质渗透率和裂缝密度对基质渗吸作用影响较大。建议该类油藏水平井与裂缝成45°部署;采油井尽可能部署在裂储比高、裂缝密度大的裂缝发育区,实现高的裂缝产出和基质渗吸贡献,实现最佳单井贡献。

Main control factors of fractured heavy oil reservoir development in Bohai Bay

The buried-hill fractured heavy oil reservoir in Bohai Bay has such characteristics as heavy oil, fractures, granite matrix and offshore. At present, there is no precedent for development at home and abroad. In order to clarify the influence of geological static parameters on the development of such reservoirs, a single parameter variable is changed by a control variable method, the key geological parameters such as fracture dip angle, fracture azimuth, fracture density, fracture opening, fracture storage ratio and permeability of matrix are analyzed and evaluated. The results show that the fracture opening, the fracture density and the fracture storage ratio have greater influence on the fracture yield, and the matrix permeability and the fracture density have great influence on the matrix imbibition. It is suggested that horizontal wells in this reservoir should be deployed at 45 degrees with fractures, and oil wells can be deployed in the fracture development area with high fracture storage ratio and large fracture density, so as to achieve high contribution to fracture production and matrix imbibition, and achieve the best single well contribution.